I'm trying to automate access to a website via scraping, and I'm trying to determine what parameters are being sent to the server in a POST request. I've currently got Wireshark open, but is there a better way to do this? Will I be able to see my POST request in plaintext, since the connection is HTTPS?

My favorite Firefox extension is Live HTTP Headers. You can either capture live headers as various HTTP requests are made, and open up page info and look at the headers for the current page that was loaded. In addition to showing both all request and response headers, it also show the contents of a POST body.